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I agree with the comments above.
To up power in the M3 without forced induction you will have to eat into BMWs safety buffers and sacrifice reliability, longevity and safety should you get a bad batch of fuel.
With a compression ratio as high as this engine I would be very wary of any power increase packages out there.
For me, exhaust and perhaps a new intake will do me, both just to improve the acoustics and the exhaust to improve the muffler look.
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